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Figure 4 Modified box plots to show variability of the incidence per million live births of total congenital heart disease (CHD), ventricular septal defects (VSDs), the remainder of CHD (total minus VSD) and all cyanotic CHD. The plots were made with StatView 5 (SAS Institute Inc., Cary, North Carolina). In them, the rectangle shows the upper and lower quartiles and the horizontal line in the middle is the median. The two short horizontal lines connected to the rectangle by thin vertical lines indicate the 90th and 10th percentiles, and data points outside these limits are shown individually.
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